Electrode Sheet Rolling Rolls With Ground Layer Against DLC Peeling
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Solution Overview
Problem
The existing rolling devices for electrode sheets face contamination issues due to rapid wear of the base material when the DLC coating film peels off, leading to the generation of fine particles that affect the quality of the electrode sheet.
Innovation Solution
A rolling device with a pair of rolling rolls, each comprising a base material, a ground layer harder than the base material, and a diamond-like carbon (DLC) coating film, where the ground layer is formed between the base material and the DLC coating film to prevent direct contact and wear, thereby reducing contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a DLC coating film is formed on the base material to increase wear resistance, then the wear resistance of the rolling roll is improved, but the DLC coating film peels off from the base material causing rapid wear of the base material
Solution Approach 1:
A ground layer is introduced as an intermediary between the DLC coating film and the base material. This ground layer serves as a transition zone that improves adhesion between the DLC coating and the base material, preventing peeling while maintaining wear resistance. The ground layer is harder than the base material but softer than the DLC coating, creating a gradual transition in material properties that eliminates the direct interface problem causing peeling.
2Reliability
If the DLC coating film peels off, then wear resistance is improved initially, but the base material rapidly wears and generates fine particles that contaminate the electrode sheet
Solution Approach 1:
The ground layer acts as a protective intermediary that prevents the base material from directly contacting the electrode sheet. Even when the DLC coating peels, the ground layer remains as a barrier, preventing rapid wear of the base material and eliminating the source of fine particles that would contaminate the electrode sheet.
Solution Approach 2:
The ground layer is prepared in advance as a protective buffer between the base material and the external environment. This pre-established protective layer ensures that even if the outer DLC coating fails, the base material is already protected from direct wear and contamination, preventing the generation of harmful fine particles before they can affect the electrode sheet quality.
Data Source
AI summary
A rolling device is a rolling device that is arranged on a conveyance path on which an electrode sheet of an electricity storage device is conveyed and includes a pair of rolling rolls. Each of the rolling rolls includes a base material, a ground layer formed at least on a rolling area of an outer peripheral surface of the base material that rolls the electrode sheet, and a diamond-like carbon (DLC) coating film formed on an outer peripheral surface of the ground layer. The ground layer is harder than the base material.